Tautou is sweetly vulnerable and the two men are superb in tricky roles: Sneaky is a parody of evil, knocking back whisky miniatures while planning his next dastardly deed, but Lopez keeps him human: the combination of cockiness and booze suggests a heart pumping beneath the fatty capitalist tissue. Ejiofor, intensely watchable from the moment we first see him hustling for business, gives Okwe tunnel vision rather than a halo: here is the man of virtue, good at chess but bad at life, struggling to give up the hope that life will turn out to resemble a board game after all. It's a fascinating, difficult film. Frears uses romance to lighten the tone without detracting from the horrors - mundane or extraordinary - that menace it.